[Dean C]

What!? You mean vBSEO doesn't do all of this for you and more

PHP Code:

$aids = explode(',',$vbulletin->options['users_allowed']);
if (!empty($vbulletin->options['vbincome_enabled']) OR !in_array($bbuserinfo[userid], $aids))
{
    print_no_permission();
} 


Checking for !($value) will match false, as the poster below me pointed out.